当桩端无坚实持力层且不扩底时，可视为端承桩。_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题判断题

当桩端无坚实持力层且不扩底时，可视为端承桩。

答案

参考答案：错

填空题

请选择方框中所给的信息补全文段的内容。

on the school tennis team; doing other sports; used to; taller and stronger

I (1)______ be short and a little weak. As I often fell ill, I realized that I had to do something to change it.
So I began jogging, playing tennis with friends and (2)______. Gradually I fell in love with sports and my
health condition has been improving all the time. Now I'm (3)______ than most students in my class and I'm
(4)______. So you see, people can surely change if they have the will and the practice!

问答题简答题

系统安全理论中，包括哪些创新概念？